"I think he'll be back for another one," Black told the Evening Standard. "I'm sure of it."

Downey Jr recently told GQ that he did not want to remain in the Iron Man role indefinitely.

He also revealed that his contract with Marvel Studios has expired.

"How many genre movies can I do?" he said. "How many follow-ups to a successful follow-up are actually fun?"

Iron Man 3 will debut in the UK on April 26 and in the US on May 3. It also features Gwyneth Paltrow, Don Cheadle, Guy Pearce, Rebecca Hall, Stephanie Szostak, James Badge Dale, Jon Favreau, Ben Kingsley and Wang Xuequi.